Re: Ambiguity about what $ means?

2017-03-06 23:09 GMT+03:00 Bram Moolenaar <Bram@moolenaar.net>:
>
> Shawn Corey wrote:
>
>> On Mon, 6 Mar 2017 08:01:58 -0800 (PST)
>> Ben Fritz <fritzophrenic@gmail.com> wrote:
>>
>> > But, you can still match end-of-line in the middle of a pattern using
>> > "\n".
>>
>> No, that matches a new-line character. The difference is that $ matches
>> the end of the line, not a character. This is called an anchor.
>>
>> "Anchors are a different breed. They do not match any character at all.
>> Instead, they match a position before, after, or between characters."
>> http://www.regular-expressions.info/anchors.html
>
> Using '\n' does not match a character.
>
> Don't try to apply terminology from some other regexp engine to Vim, it
> will just confuse you. In Vim terminology there is no anchor.

For reference: Vim documentation names such things "zero-width match"
(`:h /zero-width`). `\n` may match a character if you use it in
functions like `substitute()` (where pattern applies to one of the
string arguments), but when searching a buffer this is some kind of
pseudocharacter:

1. not zero-width because you can join lines using `s/\n//`,
2. also matches at the very end of the buffer even if `&endofline` is
set to zero (designating that last line in the buffer should not end
with a LF/CRLF/CR)
3. matches line end always, regardless of &fileformat setting (meaning
that "physically" file may contain \n, \r\n or \r when being written)
4. internally there are no characters corresponding to a line end:
each line is a NUL-terminating C string.

>
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